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Messages - sark

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Arctic sea ice / Re: The 2019 melting season
« on: Today at 05:48:19 AM »
AO index reaches positive territory briefly before this event.  What will happen next is anyone's guess.  On June 6-7 this new incursion was not predicted and AO was predicted to go positive. I was not convinced this dynamic fault could subside:

Although the models are trending toward a positive AO in the long range, this new heat incursion is strong and is forecast to pierce the polar front entirely.  The last couple have been rebuffed, and this was clear by hour +180 on each of those.  We're within 140 hours on this one and models are locked in on a pretty energetic anticyclone fed in from both sides of the planet & centered on the north pole.

Usually long range models have a better handle on the macro scale weather patterns.  This is something else.

Arctic sea ice / Re: The 2019 melting season
« on: Today at 04:02:20 AM »
It happened already every 6-8 weeks since November 2018 and completely from space to ground since May Day.  Bipolar cell.  It splashes back together in the middle and then grows octopus arms before splitting in half entirely, every 6-8 weeks, for about the past 8 months.  I could probably pull together a dozen complete polar cell split gifs I've made in that time

Arctic sea ice / Re: The 2019 melting season
« on: Today at 03:22:18 AM »
Look above the ice surface, where the enthalpy of fusion does not mask the atmospheric heat.  This is why high pressure over the Arctic is bad.  Because it comes from both Beringian and Scandinavian directions simulataneously, cuts off an anticyclone, which parks smack dab over the North Pole.

Handful of analog years or not, this is unprecedented across the board in severity and is beginning to act like a system in transition.

Arctic sea ice / Re: The 2019 melting season
« on: Today at 01:59:50 AM »

Arctic sea ice / Re: The 2019 melting season
« on: Today at 01:47:17 AM »

Click for cancer

Arctic sea ice / Re: The 2019 melting season
« on: Today at 01:12:02 AM »
I do think the polar cell is failing outright.  Richard Alley said we'd have time to respond to it, that it wouldn't be SO ABRUPT that it would happen before we could do something about it.  Not 3 years, but more like 10 or 15...  well can we get started already

*third image requires click to run

Arctic sea ice / Re: The 2019 melting season
« on: July 21, 2019, 08:59:21 PM »
Whoa.  All this talk about the social implications.  Let's focus *in this, the melting season thread*

I'm saving my big splash for when Neven gets back, out of respect.

Arctic sea ice / Re: The 2019 melting season
« on: July 21, 2019, 07:50:33 PM »
NSIDC ASIE 15% is finally record low for the date.  New record low for volume & area 2019 is locked in.

Arctic sea ice / Re: The 2019 melting season
« on: July 17, 2019, 09:35:49 PM »
ECMWF 240 hour geopotential height anomaly.  I'm not interested in arguing about 10 day forecasts, I just don't think anyone is misled by it.

Clearly we got ridge & continued northern blocking despite repeated forecasts of a diminishing event. 

Whenever there's two polar cells, the gears mesh and high pressure rips in.  Easy to predict.

Arctic sea ice / Re: The 2019 melting season
« on: July 12, 2019, 11:05:22 PM »
Will there be a tally of number of weather records broken?  It seems like a new record in 2019.

Arctic sea ice / Re: The 2019 melting season
« on: July 11, 2019, 08:17:44 AM »
Friv, that pattern change forecast by so many is turning for the worse already.  GFS has now revealed that it is expecting TWINS!

GFS 00Z 7/11 splits completely to hell throughout the whole 2 week period. 

Big ridges expected from Beringia/Scandinavia before 240 hours.

That's the Eastern US and East Atlantic. Click to run gif.  Midlats cyclone headed north up the Eastern seaboard in hour 70+

Scary storm fires up off thunderstorm activity in the GFS, hour 70-180

Arctic sea ice / Re: The 2019 melting season
« on: July 03, 2019, 04:03:44 AM »
This is a paint drip chart of Arctic geopotential height anomalies throughout the column.  Long range forecasts are still not indicating a break from this.

I think you are correct but I don't think it's exactly accurate to say the polar cell is failing -- the *single* polar cell system is now changing into a state where we have two smaller continental polar cells centered over North America and Eurasia, with increasing dominance of the NAmerican cell (IMO).

So, yes, the single-polar-cell system is failing, but we still have polar cells, they are just centered in abnormal locations and are now advecting heat into the High Arctic instead of dissipating heat entering the High Arctic (at least, advection is now occurring more often than dissipation).

Pretty much how I see it.  Except there's sort of a third polar cell going on, often over Sea of Okhotsk.

I love this video of a winter PV split

Dr Judah Cohen has published an update to the AER blog.  Forecast ensemble sees a continued cooling in upper level polar cell with continued troposphere warmth into the first weeks of July.

I was really hoping this pattern would break as soon as the snow melted of land

Arctic sea ice / Re: The 2019 melting season
« on: June 20, 2019, 02:33:16 PM »
I thought things were improving somewhat as the last ridge we were just watching over Greenland failed to pierce the polar front.  at least it isn't dual monster ridges coming from both East & West cutting the whole thing neatly in half as we have observed a half dozen times since November.  Now it's just one side at a time.

I'm guessing all that time the polar cell spent displaced out of the Arctic, lashing the continents with cold rain & snow... has warmed it up a big step.  The snow on land is virtually gone, and sure enough, the polar cell consolidates over the Arctic generally.

Chaos is entering the equation in a big way.  Predictability is falling.  This is a transition.

Policy and solutions / Re: A reference personal carbon budget
« on: June 11, 2019, 08:54:04 AM »
I'm skeptical of the whole concept because I've lived in that carbon budget.  It's unwelcome in society.  Any hail mary ideas

Y'all can go on about it being open if you want - me, I'm gonna keep on paddlin' to Prince Patrick Island.

Plant some Cycads and Citrus trees

Policy and solutions / Re: A reference personal carbon budget
« on: June 10, 2019, 08:39:44 AM »
I'll note that the SR1.5 came out within weeks of the previous "carbon budget" for 1.5C was depleted, and gave it 8 more years.  I'm skeptical that this update was driven by science more than by politics.  It's just.

whether we want to emit 360 more gigatonnes or 1100 more gigatonnes, the math is simple.  360 gigatonnes / 7.7 billion = 46.75 tonnes remain for each person on earth.  At the global average of 5.25 tonnes per annum, that's a shade under 9 years before the world population would need be carbon neutral.

don't forget Whales & Dolphins that might show up & drive up shoaling of deep ocean water.  I wanted to include Biology and Chemistry in the topic.  I'd rewrite for a new topic if anyone has a better heading.  I'm reminded of a book - put yourself to the test

Dr Judah Cohen has updated the AER blog June 7:

Continued northern blocking predicted by GFS ensemble rolling forward

*edit how do I make a chart like this?


Actually a calmer looking projection in that run.  Models flip flop between continued high polar cap height anomaly and some calming, well under 240 hrs before the next block either bobs into the Arctic, or the polar front stays intact and the pattern shifts

I think I'm gonna go get some corn

Consequences / Re: Climate change, the ocean, agriculture, and FOOD
« on: June 04, 2019, 08:37:19 AM »
Picture taken May 31 over Eastern IL near the border of IL & IN

The top slowest years for #corn planting on June 2:
1) 2019 67%
2) 1995 77%
3) 1982 85%
4) 1983 86%
5) 1996 86%
6) 1990 87%

I'm scared.  We're seeing an inability to adapt to minor stuff.  This thing has been coming on & growing for over 18 months.  We saw it in November 2016, and in November 2018 it accelerated even more.  Nobody's talking about it, why?  Are we afraid of being laughed at or ran out of town? 

You're not stupid.  You're just supporting the orderly process of discussion and discovery that worked great when we weren't in a catstrophe.

It's not scientists responsibility to fight for our lives, it's people like me who can see it... who don't have a responsibility to science, but have a responsibility to our family & communities... it's we who need to stand up and start understanding and talking about this.

These forecasts are more than ten days out - might mention that in the text.

i am not a scientist <-- it says it right here.  of course they are.  the topic of the thread ends with "long range weather forecasting".  You know, just like summer outlooks, CFS, CanSIPS, RCPs, and millions of conversations about next year, none of which are splashed with warnings about uncertainty in the 10 day forecast

I'm not responsible if you show up with an umbrella when it's sunny out.  But that granular focus to which 5, 8, 10 day uncertainty applies is not relevant to the topic.  I'd rather see a model fail and stipple out on something it can't grapple with so I can think about that and observe how whatever patterns it was projecting actually play out in real life

this isn't an observational science to me.  this is runaway climate change.  whatever climate & weather communications thus far have resulted in the US being record breaking short corn going into a planting season with no prospect of better conditions coming

In 1930 and early 1931, the Oklahoma and Texas panhandles were known as the most prosperous regions in the nation. For plains farmers, the decade opened with prosperity and growth. But in the summer of 1931, those farmers would face the most difficult eight years of their lives.... The rain simply stopped.

Maybe you don't realize it yet.  I'm safe saying the US corn yield will be down 20-30% in 2019

and that's just the tip of the iceberg

All I'm doing is seeing the truth and telling it like it is.  I'm clearly not playing scientist.  I'm trying to figure things out, do I buy my family food or air filters?  do I move?  Because I want to do that before the rush.

While we still have time I'm going to use my intelligence to figure out exactly how this thing is swinging, with or without this forum.  Please help examine the models & present conditions & reanalysis so the developing catastrophic situation can be understood

that's the last I'll say about it.

I think you are correct but I don't think it's exactly accurate to say the polar cell is failing -- the *single* polar cell system is now changing into a state where we have two smaller continental polar cells centered over North America and Eurasia, with increasing dominance of the NAmerican cell (IMO).

So, yes, the single-polar-cell system is failing, but we still have polar cells, they are just centered in abnormal locations and are now advecting heat into the High Arctic instead of dissipating heat entering the High Arctic (at least, advection is now occurring more often than dissipation).

I think I understand what you're saying..  is it like the pattern of "polar cell" has become more chaotic? 

What traces would this leave on a chart?  I'm seeing a lot of 500mb & even some 250mb easterly winds.  When the jet stream breaks in the Arctic and leaves an in intense anti-cyclone, it often moves in retrograde.  I bet that would look good on a map... but which one?

For the past 1-2 days, none of the models can decide where the next block comes from.  I hope this means the polar front stays intact

however a few runs have given a very high (360 meter plus) 500mb anomaly within 240 hours, something i've not seen since February-March

must be lining up with some wave action?  none can decide where it shows up

these blocks ripping through the jet stream into the arctic / ridges pinching off highs in the arctic / jet stream amplitude causing accelerated arctic warming... whatever has been happening more and more over the past 18 months

STILL is showing no sign of changing pattern.  Already looks like a lot of summer outlooks are going to be invalidated.  it just keeps getting worse and worse and worse

Science / Re: Projecting to 2150
« on: June 04, 2019, 06:04:40 AM »
We should be letting people know how bad it's going to get by 2030.

Yes.  It's time not just for scientists but for the citizens to stand up.  It's cold comfort but we might as well go down fighting for what's right.  it's easier.

look how vulnerable we are to almost nothing.  the structure of climate is merely degrading and we have this much trouble.  we have a profound problem.  i don't get the sense people realize it.

James G Anderson

watch this interview.

In the model runs (look at fv3 hour 200-262 from today 06z!)  The high pressure incursions are traveling CCW about Hudson Bay, incursions from the Atlantic are blowing right through the polar cell and exciting on the other side of the planet

Similar story on the Scandinavian block

The ridiculously resilient ridge and Scandinavian block are meeting at the North Pole

So far it has been exaggerated by the models and reality has seen the polar front remaining intact even when the ridge pushed above 80N and fed out anticyclones over the North Pole.  Instead of such sharp features derived by the model you see reality much more diffuse and maybe not as severe--but still

We do not have words for what is happening, so I will defer to one of the greats

Hahaha.  Ok

Long story short?  The cold is pulled away from the Arctic ocean and over the land.  Mirrored by atmospheric circulation.  This much is obvious.  Why that's the case .. ??  The literature points to the thinning sea ice.

Nobody expected the blocks from E-W to show up like they have and cause this much trouble, this early.  In fact, nobody has come out and said much about what's happening now.  But I am not a scientist.  I'll say it:  Earth's northern polar cell is failing.  This looks like the abrupt scenario.

You be the judge.


Recent Arctic amplification and extreme mid-latitude weather

Impact of sea ice cover changes on the Northern Hemisphere atmospheric winter circulation

Stratospheric response to Arctic sea ice retreat and associated planetary wave propagation changes

Amplified Arctic warming and mid‐latitude weather: new perspectives on emerging connections

Evidence linking Arctic amplification to extreme weather in mid‐latitudes

Weakening of the stratospheric polar vortex by Arctic sea-ice loss

Go to Google Scholar and key in Jennifer Francis, Judah Cohen, Jason Furtado, Baek-Min Kim, Kai Kornhuber, Dim Coumou, Stefan Rahmstorf, Potsdam Institute, etc etc.

Best briefing available is to read the papers if there isn't an academic lecture available on YouTube

for example:

Stratosphere-troposphere coupling across timescales - Jason Furtado

Jennifer Francis discussing jet stream in 2017

timestamp 2255 (37:35)

Fast atmospheric response to a sudden thinning of Arctic sea ice

Semmler, T., Jung, T. & Serrar, S. Clim Dyn (2016) 46: 1015.

In order to understand the influence of a thinner Arctic sea ice on the wintertime atmosphere, idealized ensemble experiments with increased sea ice surface temperature have been carried out with the Integrated Forecast System of the European Centre for Medium-Range Weather Forecasts.

The focus is on the fast atmospheric response to a sudden “thinning” of Arctic sea ice to disentangle the role of various different processes. We found that boundary layer turbulence is the most important process that distributes anomalous heat vertically. Anomalous longwave radiation plays an important role within the first few days before temperatures in the lower troposphere had time to adjust. The dynamic response tends to balance that due to boundary layer turbulence while cloud processes and convection play only a minor role. Overall the response of the atmospheric large-scale circulation is relatively small with up to 2 hPa in the mean sea level pressure during the first 15 days; the quasi-equilibrium response reached in the second and third month of the integration is about twice as large. During the first few days the response tends to be baroclinic in the whole Arctic. Already after a few days an anti-cyclonic equivalent-barotropic response develops over north-western Siberia and north-eastern Europe. The structure resembles very much that of the atmospheric equilibrium response indicating that fast tropospheric processes such as fewer quasi-barotropic cyclones entering this continental area are key opposed to slower processes such as those involving, for example, stratosphere-troposphere interaction.

yup.  kinda stalled out there (animates on click)

Incredible FV3-test model run from last night.  These things turn down different paths around hour 150 and derive some pretty wild results.  today's 12Z fv3 is sickening

click to run if you wish

Hour 108 T2anom from the interim GFS-FV3.  I find it interesting that the heat is stacking up right over the two cold poles that have been driving the polar atmosphere to circulate in two parcels.  what this means?

this model produced a wave 8/4 pattern in the final hour of yesterdays 18Z.  forecasters are offering views of wave 6, i dunno.

in my view, this June is going to be extremely chaotic & patterns hard to describe, but 8/4/2 makes sense given the splitness of the polar cell

Arctic sea ice / Re: The 2019 melting season
« on: June 01, 2019, 05:18:49 PM »
North coastline of Alaska is nearly open.  open water all the way to Axel Heiberg or even deeper in about a day

Consequences / Re: Climate change, the ocean, agriculture, and FOOD
« on: May 29, 2019, 04:42:29 AM »
The US just blew threw the record for prevented planting of corn. 

On May 26, the United States still had 99 million acres of both #corn and #soybeans left to plant. That is the most ever by far.

The forum / Re: New participant perspective
« on: May 28, 2019, 01:50:59 AM »
None of this matters to the physics.  This isn't an advocacy group

Air temperatures in the Arctic.  This is DJF 1000mb potential temperature.  You'll get the same signal from 1000-850mb for air temperatures.

In the cylindrical view it has the character of a standing wave.  No wonder chaos reigns.

The rest / Re: Climate on Reddit
« on: May 27, 2019, 03:11:28 AM »
true about the twitter feeds.  I just meant watch out for bots, too.

no room for an honest word any more.

the target seems to be those who engage with it.  the idea is to demoralize them so they stop speaking out.  because we're in a shit fire in 2019, they will keep coming now.  bots too.  people will do anything for no good reason, interfere with the obs next.  prank emit refrigerants.  the mood seems to be that whatever happens will be good.  death, whatever.  good.  because "just say anything" is a cheap attack on information.  and to a species that has evolved to focus on social bullshit, holding sway over conversation is far more valuable than fending for yourself.  it's a life that's only possible in complexity, and it's the first niche that will go away when things simplify further.  i just don't want to acquire bias by caring.  because i'm scared, and i don't want to lose my wits.

weather plays a big role in human mood.  changing weather, heat, severe weather & disasters all play out as different attitudes down the road.  the mood is changing and a lot of people are vocalizing it.

we are so spoiled rich, with the Earth as it was for the past 10,000 years.  it allowed civilization to become unfit in character.  there's no respect for life.  until now, superabundance made anything acceptable.  all you had to do was be in a group, hoot nonsense, and you were taken care of.

the groupies are hooting loudly into the darkness these nights

The rest / Re: Climate on Reddit
« on: May 27, 2019, 01:43:46 AM »
It's 2019.  be aware of bot floods especially when something is happening.  people are probably working to take down obs right now.

fixed the heavy loading of gifs, thank you for the help

Great contributions Sark .. but could you please up size to 701pixel so that they don't all load together .. and eat up resources unnecessarily  ? Also allowes the viewer a little more control ..  cheers b.c.

I haven't figured out how to correct the scaling & sizing issues of this forum yet, can you be more specific or point me to the right place to read about some better practice?

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